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Posted to issues@flink.apache.org by "Anton Kalashnikov (Jira)" <ji...@apache.org> on 2021/10/14 14:14:00 UTC

[jira] [Created] (FLINK-24553) Change buffer debloating default configuration values

Anton Kalashnikov created FLINK-24553:
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             Summary: Change buffer debloating default configuration values
                 Key: FLINK-24553
                 URL: https://issues.apache.org/jira/browse/FLINK-24553
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Checkpointing
    Affects Versions: 1.14.0
            Reporter: Anton Kalashnikov


After the investigation for buffer debloating effectiveness, there are some conclusion:
 * taskmanager.memory.min-segment-size can be decreased from 1024 to at least 256 because in some cases even 1024 is a too big value and at the same time the low min value is not a problem.
 * taskmanager.network.memory.buffer-debloat.samples can be decreased from 20 to 10 or taskmanager.network.memory.buffer-debloat.period can be decreased from 500ms to 100ms or 200ms. According to the investigation, the current speed of reaction is too slow so it is better to increase it by changing one of these parameters.
 * taskmanager.network.memory.buffer-debloat.threshold-percentages can be decreased from 50 to 10 because there are no problems were found when the announcement of buffer size happened more frequently but it actually can positively influent the checkpoint time.



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